Preheat oven to 350 F and line a baking sheet with parchment paper.
Place all ingredients EXCEPT the water into a large mixing bowl.
10 Tablespoons peanut butter powder, 2 Tablespoons unsalted butter, 1/2 cup granulated sugar substitute, 1 large egg, 1 teaspoon pure vanilla extract
Beat ingredients with a hand mixer on low speed until dough begins to come together. Add one tablespoon of water and mix again. Only add the second tablespoon if the dough needs to be loosened.
1-2 Tablespoons water
Spray your hands with cooking spray. Roll dough into 10 balls.
Using a fork dipped in water or sprayed with cooking spray, flatten slightly in a criss cross pattern.
Bake for 11-13 minutes, cookies will puff up a little.
I find that one tablespoon of water is usually enough as this dough can be pretty sticky. However, “slightly packed” peanut butter powder is a matter of each person’s interpretation, so if you packed in more than me, you will likely need more water than I do.
After making the cookie dough, I weigh the dough and divide by 10 to get even balls.
For the granulated sugar substitute I would recommend Allulose or Swerve. You can also experiment with Stevia, erythritol, or monk fruit sweetener though I have not tested them myself in these cookies.